Wideband Channel Sounding Using Modulated OFDM Signals

Silva, Marcelo Molina; Mello, Luiz da Silva; Rodríguez, Virgilio Ruiz; Castellanos, Pedro Gonzalez

doi:10.1109/apwc.2018.8503787

Cited by 6 publications

(2 citation statements)

References 6 publications

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“…ROACH comprised of a single transmitter and a vehicle roof mounted receive subsystem with four phased arrays, that could measure the 28 GHz wireless channel over 60 MHz of bandwidth. In this paper, we present the nextgeneration iteration of the platform which greatly exceeds the capabilities of the previous version by utilizing wideband software defined radios (SDRs) and high-speed data recorders We retain the general channel sounding philosophy from our previous ROACH design by utilizing Zadoff-Chu (ZC) sequences [15] as sounding waveforms. ROACH transmits the ZC sequence x u [n] defined as…”

Section: System Designmentioning

confidence: 99%

A Real-Time Millimeter Wave V2V Channel Sounder

Chopra¹,

Thornburg²,

Kanhere³

et al. 2022

Preprint

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Wireless communication in millimeter wave spectrum is poised to provide the latency and bandwidth needed for advanced use cases unfeasible at lower frequencies. Despite the market potential of vehicular communication networks, investigations into the millimeter wave vehicular channel are lacking. In this paper, we present a detailed overview of a novel 1 GHz wide, multi-antenna vehicle to vehicle directional channel sounding and measurement platform operating at 28 GHz. The channel sounder uses two 256-element phased arrays at the transmitter vehicle and four 64-element arrays at the receiver vehicle, with the receiver measuring 116 different directional beams in less than 1 millisecond. By measuring the full multi-beam channel impulse response at large bandwidths, our system provides unprecedented insight in instantaneous mobile vehicle to vehicle channels. The system also uses centimeter-level global position tracking and 360 degree video capture to provide additional contextual information for joint communication and sensing applications. An initial measurement campaign was conducted on highway and surface streets in Austin, Texas. We show example data that highlights the sensing capability of the system. Preliminary results from the measurement campaign show that bumper mounted mmWave arrays provide rich scattering in traffic as well a provide significant directional diversity aiding towards high reliability vehicular communication. Additionally, potential waveguide effects from high traffic in lanes can also extend the range of mmWave signals significantly.

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Section: System Designmentioning

confidence: 99%

A Real-Time Millimeter Wave V2V Channel Sounder

Chopra¹,

Thornburg²,

Kanhere³

et al. 2022

Preprint

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“…ROACH was developed as a real-time wideband correlation type channel sounder [12]. Such channel sounders operate by transmitting a known signal s(t) that typically has an autocorrelation function s(t) * s(t) equal to the Dirac-Delta impulse function δ(t).…”

Section: Channel Sounder Designmentioning

confidence: 99%

Real-time Millimeter Wave Omnidirectional Channel Sounder Using Phased Array Antennas

Chopra¹,

Thornburg²,

Kanhere³

et al. 2020

Preprint

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Characterization of the millimeter wave wireless channel is needed to facilitate fully connected vehicular communication in the future. To study the multipath-rich, rapidly varying nature of the vehicular propagation environment, fast millimeter wave channel sounders are required. We present a channel sounder design capable of covering 360 degrees in azimuth and 60 degrees in elevation with 200 individual beam directions in 6.25 ms by using four phased arrays simultaneously. The channel measurements are accompanied by high resolution positioning and video data, allowing channel sounding to be conducted while either the transmitter, or the receiver, or both are moving. Channel sounding campaigns were conducted at multiple urban locations with light traffic conditions in Austin, Texas. Preliminary results show that beam selection at the receiver can lower the effective pathloss exponent to 1.6 for line-of-sight and 2.25 for non line-of-sight.

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